ADVANCED MEASUREMENT
55
Manual
triggering
Press the Trig key to trigger the
measurement manually. The trigger
must be set to external (EXT) for
manual triggering. See page 72.
dBm/dB Measurement
Applicable to
Background
Using the ACV or DCV measurement result, the
GDM-8261 calculates the dB or dBm value based on a
reference resistance value in the following way.
dBm 10 x log10 (1000 x Vreading
2
/ Rref)
dB dBm – dBmref
Parameters Vreading Input Voltage, ACV or DCV
Vref Reference voltage obtained by
Rref/1mW
Rref Reference resistance simulating an
output load
dBmref Reference dBm value
Measure dBm
Activate dBm
Press the Shift key followed by the
key. The 1st display shows
dBm, and the 2nd display shows the
reference resistance.
/
dBm
dBm result
appears
dBm Indicates dBm measurement
600Ω
2nd display indicates the reference
resistance
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